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Title: Studies on interaction of ionic liquids with cyclodextrins in aqueous solution
Authors: Li, Hong-Gang
Zhang, Qian
Zhao, Qiang
Liu, Min
Liu, Jie
Sun, De-Zhi
Keywords: Ionic liquids;Cyclodextrins;Host-guest complexes;Microcalorimetry
Issue Date: Jun-2010
Publisher: CSIR
Abstract: Interactions between -, -, -CDs and two ionic liquids, 1-butyl-3-methylimidazolium tetrafluroborate ([bmim][BF4]) and 1-octyl-3-methylimidazolium tetrafluroborate ([omim][BF4]), have been studied with titration microcalorimetry and UV and NMR spectra at 298.15 K. The results are discussed in terms of the hydrophobic interaction of CD molecular cavity with alkyl chain of IL cation and the change in iceberg structure formed by water molecules existing around the hydrophobic tail of the ionic liquids. The stoichiometry of CDs with the two ionic liquids is 1:1 and 1:2 except that of -CD with [omim][BF4], which is only 1:1. The binding process of -CD with both the ionic liquids is entropy driven, while that of -CD and -CD with the ionic liquids is characterized by both enthalpy favorable and entropy favorable processes. The 1H NMR spectra reveal that chemical shift data of all protons in -CD, -CD and -CD molecules move to high field in the presence of ionic liquids. UV absorbance for the CD-IL systems has been detected, which indicates that the inclusion complex is formed through weak interaction.
Page(s): 752-756
Appears in Collections:IJC-A Vol.49A(05-06) [May-June 2010]

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